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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.io;
19  
20  import java.io.DataOutput;
21  import java.io.IOException;
22  import java.io.OutputStream;
23  
24  /**
25   * OutputStream implementation that wraps a DataOutput.
26   */
27  class DataOutputOutputStream extends OutputStream {
28  
29    private final DataOutput out;
30  
31    /**
32     * Construct an OutputStream from the given DataOutput. If 'out'
33     * is already an OutputStream, simply returns it. Otherwise, wraps
34     * it in an OutputStream.
35     * @param out the DataOutput to wrap
36     * @return an OutputStream instance that outputs to 'out'
37     */
38    public static OutputStream constructOutputStream(DataOutput out) {
39      if (out instanceof OutputStream) {
40        return (OutputStream)out;
41      } else {
42        return new DataOutputOutputStream(out);
43      }
44    }
45  
46    private DataOutputOutputStream(DataOutput out) {
47      this.out = out;
48    }
49  
50    @Override
51    public void write(int b) throws IOException {
52      out.writeByte(b);
53    }
54  
55    @Override
56    public void write(byte[] b, int off, int len) throws IOException {
57      out.write(b, off, len);
58    }
59  
60    @Override
61    public void write(byte[] b) throws IOException {
62      out.write(b);
63    }
64  }